I'm re-reading "Treasure Island". The when the mysterious ex-pirate who was a guest at the Admiral Benbow Inn, died after recieving the "black spot", Jim Hawkins' mother in searching the pirate's chest to get the money he owed her,
found a "gully".
I never heard of a knife by that name, but it is in my dictionary, the second definition:
gully 1
n.,
pl. 3lies 5altered < ME golet, water channel, orig., GULLET6 a channel or hollow worn by running water; small, narrow ravine
vt.
3lied, 3ly[ing to make a gully or gullies in

gully 2
n.,
pl. 3lies 5< ?6 [Brit.] a large knife